List traces with filtering and pagination. Returns trace metadata including latency, cost, and observation/score counts.
AI agents call listTraces to retrieve information from Langfuse Mcp Extended without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves and queries trace data from Langfuse with filtering and pagination options. It returns metadata about traces (latency, cost, counts) but performs no side effects, modifications, or deletions. The operation is purely informational/read-only, consistent with 'list' operations that fall under the Read category.
From the tool's definition Tool name 'listTraces' and description 'List traces with filtering and pagination. Returns trace metadata' indicate data retrieval without modification. No destructive, financial, or code execution capability is described.
Attacks that exploit this kind of access
List traces with filtering and pagination. Returns trace metadata including latency, cost, and observation/score counts. It is categorised as a Read tool in the Langfuse Mcp Extended MCP Server, which means it retrieves data without modifying state.
Register the Langfuse Mcp Extended MCP server in PolicyLayer and add a rule for listTraces: allow, deny, rate-limit, or require approval. Point your MCP client at the PolicyLayer proxy URL and the rule is enforced on every call, before it reaches Langfuse Mcp Extended. Nothing to install.
listTraces is a Read tool with low risk. Read-only tools are generally safe to allow by default.
Yes. Add a rate_limit block to the listTraces rule in your PolicyLayer policy. For example, setting max: 10 and window: 60 limits the tool to 10 calls per minute. Rate limits are tracked per agent session and reset automatically.
Set action: deny in the PolicyLayer policy for listTraces. The AI agent will receive a policy violation error and cannot call the tool. You can also include a reason field to explain why the tool is blocked.
listTraces is provided by the Langfuse Mcp Extended MCP server (langfuse-mcp-extended). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Every MCP server has a record like this.
Type a name, get the same breakdown: verified identity, auth posture, risk grade, capabilities, recommended policy.
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